DMAF-1 Floppy Disk System

The DMF-1 is a dual drive floppy disk sys�tem using double sided 8 inch
diskettes. Both drives have dual heads to allow access to both sides of the
diskette without re�moving the diskette and turning it over. Each diskette is
capable of storing up to 600,000 bytes of formatted data, giving a total "on
line" storage capacity of 1.2 million bytes. The drives are controlled by a
direct memory access (DMA) controller sys�tem. The controller plugs into one of
the unused memory slots in the SWTPC 6800 computer. A fifty conductor ribbon
cable connects the controller to the drives. The controller will operate up to
four drives.

The DMF-1 disk system requires a minimum of 24K of memory to operate. The DOS
requires 8K of memory located at an address beginning at A000 hex. We recommend
use of the 68/40 computer with this system. This provides 32K of user memory and
the 8K for the DOS in the correct address location.

The DMF-1 system is supplied with Flex, a powerful and flexible but easy to use
operating system. Programs and data files are accessed and manipulated using
file names and extensions. The operator need not specify, or even be aware of
tracks, sec�tors, file numbers, etc. as is necessary in less elegant systems. A
full feature disk BASIC with both sequential and random file hand�ling is also
included. Both BASIC and Flex incorporate access to a spool file system that
allows printer operation to occur indepen�dently of computer use and at any
desired time.

The system includes the cabinet, power supply, DMA controller, connecting
cable, diskette with software, instruction manual and two drives. Size is 17 x 5
3/8 x 20 1/2, and shipping weight is 53 lbs. The drive expansion system includes
all of the above except the controller.